Measurement of background radiation and evaluation of Life time cancer risk in highly populated motor parks in Enugu

BENSON, I.D and Ugbede, Fredrick (2018) Measurement of background radiation and evaluation of Life time cancer risk in highly populated motor parks in Enugu. International Journal of Physics & Mathematics.

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This study presents the background ionizing radiation (BIR) level of some populated motor parks in Enugu City. The parks are Holy Ghost, Old Park, Abakpa, New Market and Garriki. An In-situ measurement of BIR exposure rate in mR/h was done using a well calibrated portable Geiger Counter nuclear radiation detector (GQ GMC-320 Plus, manufactured by GQ Electronics LLC, USA). The exposure rates were used to evaluate the annual effective dose equivalent (AEDE) and excess lifetime cancer risk (ELCR) within the parks. The mean exposure rates recorded within the areas in order of magnitude are 0.0143±0.0019 mR/h, 0.0135±0.002 mR/h, 0.0114±0.0025 mR/h, 0.0112±0.0014 mR/h and 0.0112±0.0024 mR/h respectively for Abakpa, Gariki, New market, Old Park and Holy Ghost. The mean exposure rate for Holy Ghost, Old Park and New Market are below the world recorded average value of 0.013 mR/h while that of Abakpa and Garriki are slightly greater than the world average value. The corresponding absorbed doses as a result of BIR exposure in the locations are far higher than UNSCEAR recommended safe limit. The estimated mean AEDE at Holy Ghost, Abakpa, Old Park, New Market and Garriki are 0.119±0.025 mSv/yr, 0.153±0.022 mSv/yr, 0.120±0.015 mSv/yr, 0.122±0.027 mSv/yr and 0.144±0.023 mSv/yr respectively with Abakpa having the maximum value and Holy Ghost having the minimum value. All the mean AEDE are lower than the ICRP recommended permissible limits of 1.00 mSv/yr for the general public. The estimated mean ELCR are (0.418±0.087)×10-3, (0.534±0.077)×10-3, (0.419±0.052)×10-3 (0.426±0.094)×10-3 and (0.504±0.079)×10-3 respectively for Holy Ghost, Abakpa, Old Park, New Market and Garriki. These values are higher than the UNSCEAR reported world average value of 0.29×10-3. The study revealed that the BIR levels within the areas are due to the presence of natural radionuclides which are enhanced by the various human activities carried out in the areas and also due to exhaust emission of hydrocarbon combustion. The study also revealed that Abakpa Park is on higher BIR level than the other Parks. Generally, the radiation level within the areas does not constitute any immediate radiological health effect on the general public but there exist a probability of one developing cancer over a life time of exposure within the studied environments.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Natural and Applied Sciences
Depositing User: Mr. Ikenna Daniel Benson
Date Deposited: 09 Apr 2019 10:33
Last Modified: 09 Apr 2019 10:33

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